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The convective desalination of sea ice
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2014-07-01)
This thesis aims to improve our understanding of the fundamental processes affecting the growth of sea ice in the polar oceans in order to improve climate models. Newly formed sea ice contains a significant amount of salt ...
Multiple solutions in supersymmetry and the Higgs
(The Royal Society PublishingPhilosophical Transactions of the Royal Society A, 2014-11-24)
Weak-scale supersymmetry is a well-motivated, if speculative, theory beyond the Standard Model of particle physics. It solves the thorny issue of the Higgs mass, namely: how can it be stable to quantum corrections, when ...
Limits on a Gravitational Field Dependence of the Proton{Electron Mass Ratio from H2 in White Dwarf Stars
(American Physical SocietyPhysical Review Letters, 2014-09-18)
Spectra of molecular hydrogen (H2) are employed to search for a possible proton-to-electron
mass ratio (μ) dependence on gravity. The Lyman transitions of H2, observed with the Hubble
Space Telescope towards white dwarf ...
Redshifting of cosmological black bodies in BSBM varying-alpha theories
(APSPHYSICAL REVIEW D, 2014-12-04)
We analyse the behaviour of black-body radiation in theories of electromagnetism which allow
the electron charge and the fine structure constant to vary in space and time. We show that such
theories can be expressed as ...
Maximum Tension: with and without a cosmological constant
(OUPMonthly Notices of the Royal Astronomical Society, 2014-12-04)
We discuss various examples and ramifications of the conjecture
that there exists a maximum force (or tension) in general relativistic
systems. We contrast this situation with that in Newtonian gravity,
where no maximum ...
Detecting pairwise correlations in spike trains: an objective comparison of methods and application to the study of retinal waves
(Society for NeuroscienceJournal of Neuroscience, 2014-10-22)
Correlations in neuronal spike times are thought to be key to processing in many neural systems. Many measures have been proposed to summarize these correlations and of these the correlation index is widely used and is the ...
Morita cohomology
(University of CambridgeDepartment of Pure Mathematics and Mathematical Statistics, 2014-01-07)
This work constructs and compares different kinds of categorified cohomology of a locally contractible topological space X. Fix a commutative ring k of characteristic 0 and also denote by k the differential graded category ...
A 3-manifold group which is not four dimensional linear
(ElsevierJournal of Pure and Applied Algebra, 2014-01-28)
We give examples of closed orientable graph 3-manifolds having a fundamental group which is not a subgroup of GL(4, F) for any field F. This answers a question in the Kirby problem list from 1977 which is credited to the ...
Pattern-forming in non-equilibrium quantum systems and geometrical models of matter
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2014-01-07)
This thesis is divided in two parts. The first one is devoted to the dynamics of polariton condensates, with particular attention to their pattern-forming capabilities. In many configurations of physical interest, the ...
Shearing waves and the MRI dynamo in stratified accretion discs
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2014-01-07)
Accretion discs efficiently transport angular momentum by a wide variety of as yet imperfectly understood mechanisms, with profound implications for the disc lifetime and planet formation. We discuss two different methods ...